Lepidopterous pests can be a problem in corn cultivation in the southern region. This study investigated the occurrence of Ostrinia furnacalis, Helicoverpa armigera and Pseudaletia separata in corn field of southern region. O. furnacalis has investigated aspects occur in Iksan, Buan and Gochang. H. armigera and P. separata has investigated the aspects occur in Buan and Gochang. Occur from early May in sex pheromone trap, showing the highest density occurs in late May, the 1st occurrence of O. furnacalis adult was reduced since the beginning of June. the 2nd occurrence of O. furnacalis adult occurs in late August and showed the highest density occurred in early September. Occurrence time showed aspects similar to the three regions of the O. furnacalis adult. 1st adult occurs in early May from Buan, H. armigera showed the highest density occurs in early August and showed the highest density occurs in early July from Gochang. The 1st adult P. separata occurs in late April, showed the highest density occurs in late June from Gochang. However, the incidence density was lower in Buan.

• Hwi-Jong Lee(National Institute of Crop Science (NICS), RDA)
• Man-Young(National Institute of Crop Science (NICS), RDA)
• Hyeong-Kwon Shim(National Institute of Crop Science (NICS), RDA)
• Tae-Hwan Noh(National Institute of Crop Science (NICS), RDA)
• Chae-Hoon Paik(National Institute of Crop Science (NICS), RDA)